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A guide to inline assembly for C and C++

First, the authors describe basic usage syntax for inline
assembly (inline asm) embedded within C and C++ programs. Then they
explain intermediate concepts, such as addressing modes, the
clobbers list, and branching stanzas, as well as more advanced
topics, such as memory clobbers, the volatile attribute, and locks
are discussed for those who want to use inline asm in multithreaded
applications. See the article here.